एपीए उद्धरण

Lansford, L., & Lewis Lansford. (2014). Unlock: Listening and speaking skills. Cambridge: Cambridge University Press.

शिकागो स्टाइल उद्धरण

Lansford, Lewis, और Lewis Lansford. Unlock: Listening and Speaking Skills. Cambridge: Cambridge University Press, 2014.

एमएलए उद्धरण

Lansford, Lewis, और Lewis Lansford. Unlock: Listening and Speaking Skills. Cambridge: Cambridge University Press, 2014.